Triceratium montereyi (spelt Mountereyii on the label) from Long Beach, California, USA. Single example on the slide. Mounted in Styrax. No makers name but based on the style it may be by Wallace Frederick Reeve. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 109 images Pmax. Raised flat top region in the middle which is characteristic of this species.
Triceratium montereyi T.Brightwell 1853. Published in: Brightwell, T. (1853). On the genus Triceratium, with descriptions and figures of the species. Quarterly Journal of Microscopical Science, London 1: 245-252, pl. IV. Page 251, Plate IV, Figure 18 (as ‘Montereyii‘).